It's hard to tell where to start with your question, but it seems like some approaches below may be helpful.

• Separation of content and code
• might also want to look at HTML::Template as one approach
• and Template::Toolkit as another.
• You may not need it, but it never hurts to review Ovid's Web Programming Using Perl course.

  edited to add:

• Why use templates?
• So, what *is* the best way to deliever dynamic content nowadays?

And, I'm sure others will have many other leads for you, including anything you can find on separating data, logic, and presentation.

HTH